Garmin GPS 12XL Owner's Manual (Software Version 4.0 and above) - Page 20

REFERENCE Maximum Speed & Altitude Fields Resetting the trip odometer will erase the previous mileage and set the odometer to zero. Average speed, maximum speed and timer readouts will also be reset to zero. To reset timer, speed measurement, or odometer: 1. Highlight the user-selectable field, and press . 'Reset' will appear as a selectable option (see left). 2. Press to confirm or to exit. The trip odometer, trip timer, and average speed fields are linked. Resetting one of these options in a user-selectable field will automatically reset the corresponding data in the other. This ensures that information shown in these fields reflects your current trip. Maximum Speed Field To obtain the most accurate reading of average speed, keep in mind that due to the sensitivity of the GPS 12XL's antenna, your maximum speed value may include the effects of rapid movement, such as swinging your arm while holding the unit. To reset the maximum speed field: 1. Highlight the 'MXSPD' field, and press . 2. Press to confirm the 'RESET?' prompt. Altitude Field When the GPS 12XL is acquiring satellites or navigating in the 2D mode, the last known altitude is used to compute your position. You may also manually enter your altitude for greater accuracy. In cases where the GPS 12XL has 2D coverage, entering your approximate altitude will enable the receiver to determine a more accurate position fix. To enter an altitude: 1. Highlight the 'ALT' field, and press . 2. Enter a value, and press . You may enter a known altitude to assist the GPS 12XL in establishing a more accurate 2D position fix. 16